CN105339715B - pipe connector - Google Patents

Abstract

The invention relates to a pipe connection for connecting thin-walled pipes (1), in particular of metal, comprising: a conduit (1) with a deformed connecting section which, starting from its connecting end, increases in a truncated cone shape with a cone angle and at the same forms a circumferential sealing surface (7) on its outer circumference and has a shoulder adjoining the sealing surface with a stop surface (9). The pipe connection furthermore comprises a connection socket (20a) having a connection thread (25a) and a connection bore (23a) which, starting from its opening, decreases in a truncated cone shape with a cone angle adapted to the cone angle of the connection section in the region of the sealing surface (7) and at which a circumferential connection surface (27a) for resting against the sealing surface (7) is formed on the inner circumference; and a locking screw connection (10a) having a tensioning thread (13a) and having a through-opening which has a circumferential tensioning surface (15a) on the inner circumference for abutting against the stop surface (9). The cone angle of the connecting section in the region of the sealing surface (7) and the cone angle of the connecting bore (23a) in the region of the connecting surface (27a) are 38 DEG to 50 deg. The invention also relates to a pipe (1) and a connecting socket (20a) for a pipe connection according to the invention.

Description

pipe connector

technical field

The invention relates to a pipe connection for connecting thin-walled conduits, in particular of metal, comprising a conduit with a deformed connection section which is truncated from its connection end at a conical angle enlarged and here forms a surrounding sealing surface on its outer peripheral surface and has a shoulder with a stop surface adjacent to the sealing surface; and a connecting sleeve with a connecting thread and a connecting hole, the connecting Starting from its opening, the bore decreases frusto-conically with a cone angle adapted to the cone angle of the sealing surface, and a circumferential connecting surface for abutting against the sealing surface is formed on the inner circumference; and the lock Tight screw connector It has a tensioning thread and has a through-opening which has a circumferential tensioning surface on the inner circumference for bearing against the stop surface. The invention also relates to conduits and connection sockets for such pipe connections.

Background technique

The pipe connections described above are used, for example, in hydraulic systems in machine and vehicle construction.

Such a pipe connection is known, for example, from DD 240 059 A1. A conduit is used in this line connection, the conical angle of the sealing surface of the connecting section of the conduit and the conical angle of the connecting opening in the region of the connecting surface of the connecting sleeve is at most 24°.

Such pipeline connections are used for conduits with a maximum pipeline pressure of 800 bar. In order to reliably ensure the tightness of the pipeline connection under such pipeline pressure, a sufficiently large axial tension must be transmitted to the connection section of the conduit through the locking screw connection, especially to the stop surface and the sealing surface, And to the connection surface of the connection sleeve. The known pipe connectors produced by deformation have the disadvantage that, especially for thin-walled pipe connectors, an inward collapse of the sealing surface can occur during the deformation process This means that the pipe wall does not bear against the inner contour of the forming tool during the forming process, but collapses inwards towards the pipe axis. This inward collapse disadvantageously impairs the sealing function of the line connection, since the sealing surface of the line no longer rests completely on the connection surface of the connection sleeve in the assembled state.

Contents of the invention

The object addressed by the present invention is to provide a pipe connection, a conduit for the same, and a connection sleeve, so that for especially thin-walled conduits, during the deformation process, inward collapse is avoided and at the same time the conduit The connection piece can provide sufficient sealing function.

According to the invention, this object is solved in that the conical angle of the connecting hole in the region of the connecting surface of the connecting sleeve and the conical angle of the connecting section in the region of the sealing surface of the conduit has a magnitude of 38° to 50°. With a steeper cone angle of at least 38°, the sealing surface can be formed shorter in the direction of inclination with the same shoulder height. Therefore, especially for thin-walled conduits, the relationship between the wall thickness s of the conduit wall and the outer diameter d of the conduit is 0.04≤s/d≤0.08, which avoids damage to the sealing surface during the deformation process. Inward collapse (Inneneinfall). In addition, sufficient axial tension can be transmitted via the locking screw connection to the connecting section of the conduit, in particular to the stop and sealing surfaces, and to the connecting surface of the connecting sleeve without requiring any adjustments to the connection. Sections are plastically deformed. In addition, when the taper angle is 38° to 50°, a sufficiently large tightening force is also ensured, and the tightening force extends from the sealing surface to the connection surface and is perpendicular to the sealing surface. This provides a pipe connection with an improved sealing function.

In a further embodiment of the invention, the cone angle α of the connecting hole and connecting section in the region of the sealing surface has a magnitude of 38° to 42°, preferably 40°. This achieves a particularly good balance between the avoidance of inward collapse on the sealing surface and the quantification of the axial tension and tightening forces during the forming process, thus ensuring an optimum sealing function of the pipe connection. It is advantageous according to the invention if the radial height H of the shoulder is 0.5 mm to 5 mm, in particular 0.5 mm to 3 mm, preferably 1 mm to 2 mm. The invention is based on the recognition that, for an effective transmission of axial tension, the shoulder of the connecting section should have a sufficient height depending on the diameter and the wall thickness of the conduit.

In a further embodiment of the invention, the connecting section reduces frusto-conically from the shoulder to the initial conduit outer circumference at a cone angle β, and there forms a circumferential stop surface on its outer circumference, wherein After the thread has been tightened, the through-opening of the locking screw connection is reduced frusto-conically at a cone angle β' adapted to the cone angle of the connection section in the region of the stop surface, and there A circumferential tensioning surface for bearing against the stop surface is formed on the inner circumference. This has the advantage that the connecting section of the line is clamped radially during the screw connection.

In an advantageous further embodiment of the invention, the cone angle β is at least 90° greater than the cone angle α. In particular, the conical angles β, β' of the connecting section in the region of the stop surface and of the through-opening in the region of the tensioning surface are 120° to 180°, and preferably 140° or 180°. , where the cone is no longer given in the latter case. This prevents the tubes from co-rotating during assembly. In addition, a cone angle ≥ 120° results in a lower assembly tightening moment, since the normal force perpendicular to the stop surface is lower than with a cone angle < 120°. With a cone angle of 180°, frictional forces are minimized and compensation of axial center differences between the swaged tube cone and the rear tube region is achieved.

In another embodiment of the present invention, the locking screw connection is configured as a locking screw, wherein the connecting thread of the connecting sleeve is configured as an internal thread on the inner circumference of the connecting hole of the connecting sleeve, and the tensioning thread is configured as is the external thread on the outer circumference of the locking bolt. This has the advantage that the tube contour can protrude deeper into the connecting sleeve, so that the axial installation height is smaller. This provides a particularly compact design for the line connection according to the invention.

In another embodiment, the connecting sleeve is replaced by a bore of a component of the fluid system (eg, valve block or kit). This enables an even more compact solution and additional cost savings.

Description of drawings

Further details, features and advantageous further configurations of the invention emerge from the exemplary embodiments described below and shown in the drawings, as well as from the subclaims. in:

Figure 1 shows a section through an embodiment of a conduit for a pipe connection according to the invention,

Figure 2 shows a side view with a partial section of a first embodiment of a pipe connection according to the invention,

Figure 3 shows a side view with a partial section of a second embodiment of a pipe connection according to the invention,

Fig. 4 shows a side view, partly in section, of a third embodiment of a pipe connection according to the invention,

Fig. 5 shows a side view with partial section of a fourth embodiment of a pipe connection according to the invention,

6 shows a section through an embodiment of a tool for producing a catheter according to the invention by means of an axial forging process (Axialstauchverfahren),

7 shows a cross-section of an embodiment of a tool for manufacturing a catheter according to the invention by means of a swing process (Taumelverfahren), and

FIG. 8 shows a side view in partial section of another embodiment of a pipe connection according to the invention.

In the different representations of the drawings, identical parts are always provided with the same reference symbols.

detailed description

In the ensuing description, it is disclosed as the main aspect of the invention that the invention is not limited to the embodiments and not here to all or several features of the described combination of features, but rather the embodiment/every embodiment Each individual sub-feature can also have an inventive meaning in itself separately from all other sub-features described in conjunction with it, and also in combination with any features of other exemplary embodiments and independently of the features Inventive significance in the combination and the citation relationship of the claims, and in particular in the combination of the features of claim 1.

An embodiment of a conduit 1 for a pipe connection according to the invention is shown in FIG. 1 . The catheter 1 is in particular configured as a thin-walled catheter 1 . The conduit 1 is formed from a metallic tube material, in particular from steel, copper, brass or stainless steel. Considering the catheter 1 as a thin-walled catheter 1 within the meaning of the invention, 0.04≦s/d≦0.08 holds true for the relationship between the wall thickness s of the pipe wall 3 and the outer diameter d of the catheter 1 .

The conduit 1 has a deformed connection section 5 with a length L at its connection end. The connection section 5 is designed to increase frusto-conically from the connection end of the catheter 1 up to the largest outer circumference and forms a shoulder 6 with a height H on the outer circumference of the catheter 1 . In the catheter according to the invention, the height H of the shoulder is 0.5 mm to 5 mm, especially 0.5 mm to 3 mm, preferably 1 mm to 2 mm, depending on the diameter and wall thickness of the catheter. The frustoconically enlarged region of the connecting section 5 forms a surrounding sealing surface 7 on its outer peripheral surface. The sealing surface 7 and the shoulder 6 merge directly into one another. The connecting section 5 has a cone angle α in the region of the sealing surface 7 . In the embodiment shown, the connection section 5 is also configured such that it decreases frusto-conically from the shoulder 6 with the largest outer circumference to the initial tube outer circumference. The frustoconically reduced area of the connecting section 5 forms a circumferential stop surface 9 on its outer circumference. The connection section 5 has a cone angle β in the region of the stop surface 9 . As an alternative to a frustoconically reduced area, the connecting section 5 can also form a stop surface perpendicular to the pipe axis on the largest outer circumference.

A first embodiment of the pipe connection according to the invention is shown in FIG. 2 in the screwed-together state. The line connection comprises a conduit 1 according to FIG. 1 , a first embodiment of a locking screw connection in the form of a union nut 10 a and a first embodiment of a correspondingly adapted connecting sleeve 20 a.

The union nut 10a comprises a through-opening, with which the union nut 10a is pushed onto the catheter 1 . On the side of the steering connection socket 20a, the union nut 10a is designed as a hollow cylinder and has a clamping thread 13a designed as an internal thread. Adjoining the tensioning thread 13a, the through-opening has a frustoconically reduced area, which forms a tensioning surface 15a on the inner circumference of the union nut 10a. The through-opening has a cone angle β′ in the region of the tension surface 15 a which is adapted to the cone angle β of the connection section 5 in the region of the stop surface 9 of the conduit 1 . As an alternative to a frustoconically reduced area of the through-opening, the union nut 10a can also form a tensioning surface perpendicular to the pipe axis. A further hollow-cylindrical region adjoins the frustoconically reduced region of the through-opening, by means of which the union nut 10 a is mounted displaceably on the outer circumference of the conduit 1 . An outer hexagonal structure (Auβensechskant) 17a is arranged on the outer circumference of the union nut as an active surface for the screw connection tool.

The connecting sleeve 20a is designed as a hollow cylinder and comprises a connecting hole 23a for accommodating the catheter 1 on its side facing the union nut 10a, and an external thread on the outer circumference of the connecting hole 23a for connecting The connecting thread 25a that the locking nut 10a is screwed with the connecting sleeve 20a. The connecting hole 23 a is formed in a frusto-conical shape reducing inwards starting from the end face of the connecting socket 20 a , wherein the inner circumference of the connecting socket 20 a forms a connecting surface 27 a in this region. The connection hole 23 a has a cone angle α′ in the region of the connection surface 27 a , which is adapted to the cone angle α of the sealing surface 7 of the conduit 1 . A hollow-cylindrical region of the connecting hole 23 a adjoins a frustoconical region of the connecting hole 23 a , the inner diameter of which corresponds to the smallest inner diameter of the connecting surface 27 a.

The end of the connecting sleeve 20a remote from the catheter 1 is not shown in FIG. 1 and can not only be configured as a component for connecting a fluid system (eg, a valve block or a kit) or as a mirror image of the end shown. Another connecting hole 23a and another connecting thread 25a are configured for connecting another conduit.

The catheter 1 is inserted with its connecting section 5 into the connecting opening 23a of the connecting socket 20a, wherein the union nut 10a is screwed onto the connecting thread 25a of the connecting socket 20a by means of the tensioning thread 13a. When the lock nut 10a is screwed to the connection sleeve 20a, the axial tension Fax is applied to the stop surface 9 of the conduit 1 by means of the tension surface 15a of the lock nut 10a, so that the seal of the conduit 1 The surface 7 is pressed against the connection surface 27a of the connection socket 20a, so that the sealing surface 7 rests on the connection surface 27a in a sealing manner.

The connection section 5 of the conduit 1 is deformed in particular by an axial swaging process or a swivel process described further below. In this production method, especially in the case of thin-walled conduits 1 , the problem arises that if the length of the sealing surface 7 along the slope exceeds a certain length depending on the diameter, wall thickness and material of the conduit, then in the Inward collapse may occur on the sealing surface 7 during the deformation process. This inward collapse disadvantageously impairs the sealing function of the pipe connection, since the sealing surface 7 of the line no longer rests completely on the connection surface 27 a of the connection sleeve 20 a in the assembled state. Tests have shown that inward collapse at the sealing surface 7 can be avoided by shortening the axial length of the sealing surface 7 during the production of the connecting section 5 . However, the height of the shoulder 6 must therefore be reduced for the given cone angle α of the connection section 5 in the region of the sealing surface 7 . However, this disadvantageously impairs the maximum axial force F _ax that can be exerted on the conduit 1 during the screw connection of the locking screw connection, thereby damaging the conduit and impairing the tightness of the pipe connection. However, if the cone angle α of the connection section 5 is increased, the length of the sealing surface 7 can be shortened without changing the height H of the shoulder 6 of the connection section 5 . Of course, the tightening force F _α extending perpendicularly to the sealing surface 7 from the sealing surface 7 toward the connecting surface 27a decreases with increasing cone angles α, α′ on the sealing surface 7, thus from the cone angle α, A specific size of α' does not guarantee a sufficient sealing function.

According to the invention, the connection section 5 in the region of the sealing surface 7 and the connection hole 23 a in the region of the connection surface 27 a has a cone angle α or α′, which has a value of 38° to 50°, in particular 38° to 42°. In the preferred embodiment shown, one of the cone angles α, α′=40°. This reduces the deformation length of the conduit 1 and thus the instability of the conduit 1 , and in particular also for the above-mentioned thin-walled pipes, prevents an inward collapse at the sealing surface 7 during the deformation process. At the same time, by means of such cone angles α, α' to provide a sufficient height H of the shoulder 6 of 0.5mm to 5mm, especially 0.5mm to 3mm, preferably 1mm to 2mm, and a sufficiently large The clamping force F _α , so that the tube is not damaged during the screw connection and a sufficient sealing function is ensured, and the sealing surface 7 and the connecting surface 27 a bear against each other on all sides.

Furthermore, the cone angles a, a' ensure ≧38° to 50°, so that the catheter 1 deforms less in the end position and the force rise when reaching the end position can be felt more pronounced.

During the screw connection of the locking screw connection, in particular of the union nut 10a, to the connecting sleeve 20a, in order to prevent the catheter 1 from rotating during assembly, it is advantageous if the connection section 5 in the region of the stop surface 9 The cone angle β and the cone angle β′ of the through-opening of the union nut 10 a in the region of the tensioning surface 15 a are smaller than the connection section 5 in the region of the sealing surface 7 and the connecting hole 23 a in the region of the connecting surface 27 a. The cone angles α, α' are at least 90°. According to the invention, the values of the cone angles β, β′ lie in the range of 120° to 180°. Preferably, the cone angles β, β′ are 180° in order to minimize friction and to compensate for axial center differences. In the illustrated embodiment, the cone angles β, β′ are calculated to be =140°. This prevents co-rotation of the catheter 1 during assembly. In addition, lower assembly tightening torques are achieved with larger cone angles β, β' of ≥ 120°, since the normal force F _β perpendicular to the stop surface 9 is greater than that at smaller cone angles β, β' The case is smaller. However, it is additionally advantageous if the cone angles β, β′<180°, since this ensures a radial tube tightening on the stop surface 9 .

The second embodiment according to the invention according to FIG. 3 is distinguished from the first embodiment according to FIG. 2 , in particular by the configuration of the connecting hole 23 b of the connecting sleeve 20 b. The connecting bore 23b is designed to likewise decrease frusto-conically inwards starting from the end face of the connecting socket 20b , wherein the inner circumference of the connecting socket 20b forms a connecting surface 27b in this region. In the area of the connecting surface 27 b , the connecting hole 23 b has a cone angle α′ which is adapted to the cone angle α of the connecting section 5 in the area of the sealing surface 7 of the conduit 1 .

A circumferential sealing groove 28b for receiving a sealing element 29b is present at the end of the connecting surface 27b. The sealing groove 28b adjoins a hollow-cylindrical region whose inner diameter is smaller than the smallest inner diameter of the connecting surface 27b, so that behind the sealing groove 28b an advantageous annular stop surface 30b is formed in the connecting hole 23b. The stop axially limits the accommodation of the conduit 1 in the connecting hole 23b. This has the advantage that the assembly end point can be detected more easily by the force increase during assembly.

The end of the connecting sleeve 20b remote from the catheter 1 is not shown in FIG. A further connecting hole 23b and a further connecting thread 25a are configured in a mirror image for connecting another conduit.

A third embodiment of the pipe connection according to the invention is shown in FIG. 4 . This embodiment comprises a catheter 1 according to FIG. 1 and a locking screw connection in the form of a locking screw 10c and a connecting sleeve 20c.

The union nut 10c comprises a through-opening, with which the union nut 10c is pushed onto the catheter 1 . On the side of the through-opening steering connection socket 20c, the union nut 10c has a clamping thread 13c configured as an external thread.

Following tensioning of the thread 13c, an external hexagonal structure 17c is provided on the outer periphery as an active surface for the screw connection tool. The end face of the steering connection socket 20c of the locking screw 10c forms a frusto-conically inwardly extending through-opening, which forms a tensioning surface 15c on the inner circumference. The through-opening has a cone angle β′ in the region of the tension surface 15 c which is adapted to the cone angle β of the connection section 5 in the region of the stop surface 9 of the conduit 1 . As an alternative to the tensioning surface 15 c extending frusto-conically, it is also possible to form a tensioning surface perpendicular to the pipe axis. Adjacent to the frusto-conically extending region of the through-opening is a hollow-cylindrical region, by means of which the union nut 10 c is movably mounted on the outer circumference of the catheter 1 .

The connecting sleeve 20c is designed as a hollow cylinder and comprises a connecting hole 23c for accommodating the catheter 1 on its side facing the union nut 10c, and an internal thread on the inner circumference of the connecting hole 23c for The connecting thread 25c that screw-connects the locking nut 10c and the connecting sleeve 20c. In the connection hole 23c, a circumferential projection 26 protruding inwards is arranged on the inner circumference following the connection thread 25c. Adjacent to this projection, the connection opening 23c is formed as a frusto-conically inwardly extending region which forms a connection surface 27c on its inner circumference. In the region of the connecting surface 27 c , the connecting hole 23 c has a cone angle α′ which is adapted to the cone angle α of the connecting section 5 in the region of the sealing surface 7 of the conduit 1 .

Adjacent to the end of the connecting surface 27c is a hollow-cylindrical sealing region 28c in which a form seal 29c is arranged. The form seal 29 c is designed such that it is adapted to the cone angle α of the connection section 5 in the region of the sealing surface 7 of the conduit 1 . Another hollow cylindrical area adjoins the sealing area 28c, the inner diameter of which is smaller than the inner diameter of the sealing surface 28c, so that the sealing area 28c then forms an annular stop surface 30c in the connecting hole 23c, which stops The stop faces axially limit the accommodation of the conduit 1 in the connection bore 23c. This has the advantage that the assembly end point can be detected more easily by the force increase during assembly.

Shown in FIG. 4 is that the end of the cuff 20c remote from the catheter 1 is configured for connection with components of a fluid system (eg, a valve block or kit). Alternatively, a further connection hole 23 c and a further connection thread 25 c can also be configured in a mirror image for the connection of further catheters 1 .

In the third embodiment according to FIG. 4 , the connection point for the pipe contour is located closer to the screw-in plane Z-Z, whereby the axial installation height is considerably smaller, for example up to the start of the pipe bend. This provides a particularly compact design for the line connection according to the invention.

A fourth embodiment of a pipe connection according to the invention is shown in FIG. 5 . This embodiment is designed theoretically like the third embodiment in FIG. 4 with the same connection hole 23c, the same connection thread 25c and the same locking screw 10c. However, in this embodiment, the connection hole 23c is not in a dedicated connection socket but in a component of the fluid system (eg, valve block or kit) 2Od. This enables a more cost-effective and space-saving construction of the pipe connection according to the invention.

Another embodiment of the pipe connection according to the invention is shown in FIG. 8 . In this case, identical components or components with the same function as those contained in FIGS. 1 to 6 are identified with the same reference numerals.

In this embodiment, a spacer ring 10 e is arranged between the tensioning surface 15 a of the diverting connection sleeve 20 a of the locking screw connection 10 d and the stop surface 9 of the line 1 . The spacer ring 10e has a counter surface 10f which rests against the stop surface 9 in the tensioned state, which counter surface has an inclination relative to the longitudinal axis X-X of the pipe connection according to the angle of cone β to the stop surface 9. The inclination is adapted so that a comprehensive force transmission is possible. Furthermore, the spacer ring 10e has an abutment surface 10g opposite the clamping surface 15a of the locking screw connection 10d. Preferably, the tensioning surface 15a and the contact surface 10g extend perpendicularly to the longitudinal axis X-X of the pipe connection. In order to accommodate or position said spacer ring 10e, the locking screw connection 10d has a recess 10h of circular cross-section coaxial to the longitudinal axis X-X, which is arranged in the extension of the tensioning thread 13a. The effect of the spacer ring 10e according to the invention is that material burrs that may arise during the deformation of the catheter 1 due to the high deformation pressure between the segments 43 of the tensioning element 42 are not engraved (eingraben) on the stop surface 9. ) into the locking screw connection 10d, thereby preventing the risk of the catheter 1 according to the invention turning together when the locking screw connection 10d is tightened in the final assembly process. The spacer ring 10e according to the invention reliably prevents such co-rotation. Through the slightly conical (leicht konische) stop surface 9 on the conduit 1 and the corresponding surface 10f of the conical design of the spacing ring 10e in the same way, for example at an angle β of 140°, the spacing ring 10e can be positioned relative to the conduit. 1 Centering (zentrieren). Due to the radially extending contact surface 10g of the spacer ring 10e and the correspondingly aligned tensioning surface 15a of the locking screw connection 10d, frictional forces on both contact surfaces are minimized. The spacer ring according to the invention can also be arranged between the tensioning surface 15c and the stop surface 9 in the embodiments according to FIGS. The ground stop surface 9 can extend conically and the spacer ring can then have a correspondingly extended contact surface.

As already mentioned above, the catheter 1 according to the invention is produced by means of an axial swaging process or a swivel process.

FIG. 6 shows the tool for producing the catheter 1 according to the invention according to FIG. 1 with the aid of an axial forging process with the catheter 1 already deformed. The tool comprises a swaging tool 41 a and a tensioning element 42 . The swaging tool 41 a shapes the sealing surface 7 of the conduit 1 . The tensioning element 42 shapes the stop surface 9 of the catheter 1 . The axis A of the swaging tool 41 a is arranged flush with the axis A of the catheter 1 , wherein the swaging tool 41 a is arranged axially displaceable.

On the side facing the tensioning element 42 , the swaging tool 41 a has a recess 45 a for receiving the end section of the conduit 1 to be deformed. The recess 45a is formed frusto-conically at its edge with a cone angle α″ which is adapted to the cone angle α of the connection section 5 of the conduit 1 in the region of the sealing surface 7. The recess 45a is formed on its surrounding A profile 46a is formed on the edge. The bottom 47a of the recess 45a extends conically from the edge of the surrounding profile 46a in the direction of the tensioning element 42 and forms a pointed point flush with the axis of the catheter 1 to be deformed 48a. Here, the conical angle of the bottom is 180°-α", so that the conical surface of the bottom 47a encloses an angle of 90° with the profile 46a. The diameter of the recess 45a is adapted to the tube diameter of the catheter 1 to be deformed. The tensioning element 42 consists in particular of a plurality of segments 43 which can be opened and closed radially and clamp or fix the catheter 1 axially and radially. The tensioning element 42 forms, on the side facing the swaging tool 41a, a frustoconical opening with a cone angle β″, which corresponds to the cone angle of the connection section 5 of the conduit 1 in the region of the stop surface 9 β is compatible. On the circumference of the truncated cone-shaped opening, a second profile 49 is formed. In the axial forging process, the forging tool 41 arranged along the axis of the pipeline axially squeezes the pipe 1 to be deformed. The end piece also deforms the contour on the catheter 1. In this case, the catheter 1 is held behind the deformation site by the section 43 of the tensioning element 42 in a non-positive and/or form-fit manner.

FIG. 7 shows a tool for producing the catheter 1 according to the invention according to FIG. 1 with the aid of the rocking process, with the catheter 1 already deformed. The tool comprises an oscillating tool (Taumelwerkzeug) 41b and the same tensioning element 42 as already described in the axial forging process. The oscillating tool 41 b shapes the sealing surface 7 of the conduit 1 . The pivoting tool 41 b has a central axis of rotation B about which the pivoting tool 41 b is mounted freely displaceable in the machine in the direction of rotation so that it can abroll on the outer circumference of the catheter 1 . Furthermore, the swivel tool 41 b is mounted rotatably around the pipe axis A and axially displaceable along the pipe axis A. As shown in FIG. The axis of rotation B is arranged obliquely to the pipe axis A and encloses a pivot angle γ with the pipe axis A. The swivel angle γ is in particular between 2° and 20°. In the illustrated oscillating tool 41b, the oscillating angle γ is 8°.

The swivel tool 41b has a recess 45b on the side of the deflection tensioning element 42 for receiving the end section of the catheter 1 to be deformed. The recess 45b is formed frusto-conically at its edge with a cone angle α"' which is thus adapted to the cone angle α of the connection section 5 of the conduit 1 in the region of the sealing surface 7 and to the swivel angle γ Match, so that α"'=α+2γ. The recess 45b forms a profile 46b on its surrounding edge. The base 47b of the recess 45b extends conically at an angle from the edge of the surrounding profile 46b in the direction of the tensioning element 42 and forms a point 48b on the axis A of the catheter 1 . Here, the taper angle of the bottom is 180°-α"', so that the taper surface of the bottom 47b encloses an angle of 90° with the profile 46a. The diameter of the recess 45b is adapted to the pipe diameter of the catheter 1 to be deformed. The swivel tool 41b is conical in an edge region 50 surrounding the opening of the recess 45b at a swivel angle γ, so that an edge region 50 correspondingly abuts against the tensioning element 42 during rotation is parallel to the tensioning element The end face 51 of 42 extends. In the oscillating process, the oscillating tool 41b is driven rotatably around the pipe axis A and simultaneously pushed axially along the pipe axis A onto the end piece of the catheter 1. Here, the The A-arranged, rotating oscillating tool 41b presses against the end piece of the catheter 1 only locally at one point of the outer circumference and forms the contour on the catheter 1 , wherein the catheter 1 is likewise held in the deformed position by the tensioning element 42 The rear is held. The pendulum process has the advantage that it is particularly labor-saving, since the required axial force is approximately 2/3 less than in the axial forging process.

The invention is not limited to the shown and described exemplary embodiments, but also includes all embodiments which function identically within the meaning of the invention. It should be clearly emphasized that the exemplary embodiment is not limited to all features in combination, but that each individual sub-feature can also have an inventive significance in itself separately from all other sub-features. Furthermore, the present invention is not limited to the combination of features defined in the respective independent claims so far, but can also be defined by any other combination of specific features of all the individual features disclosed in total. This means that substantially virtually every individual feature of the corresponding independent claim can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. In this regard, the claims are to be understood only as a first draft attempt for the invention.

Claims (33)

1. the conduit coupling of the conduit (1) of the thin-walled for connecting metal, including：

- carry the connection section (5) through deformation conduit (1), the connection section since its connection end with cone angle frustum-like shape Increase and form on its outer peripheral face circular sealing surface (7) here and with sealing surface adjoining with the The shoulder (6) of one stop surface (9),

- and connecting pipe box (20a, 20b, 20c), it carries connection screw thread (25a, 25c) and connecting hole (23a, 23b, 23c), The connecting hole is adapted since its opening with the cone angle with the connection section (5) in the region of the sealing surface (7) Cone angle ' frustum-like shape reduce, and form here in inner circumferential for abutting in surrounding on the sealing surface (7) Joint face (27a, 27b, 27c),

- and set and locking screw connector (10a, 10c), it is with tensioning screw thread (13a, 13c) and carries pass through openings, the insertion Be open has the circular tensioning face (15a, 15c) for being used for abutting on first stop surface (9) in inner circumferential, wherein, institute Connection section (5) is stated from the shoulder (6) until initial pipeline periphery is reduced with cone angle beta frustum-like shape, and is existed here Circular the first stop surface (9) is formd on its outer peripheral face,

Characterized in that,

Adjoin the pass through openings of the set and locking screw connector (10a, 10c) of tensioning screw thread (13a, 13c) with described the Reduce cone angle beta ' frustum-like shape that the cone angle beta of the connection section (5) in the region of one stop surface (9) is adapted, and The circular tensioning face (15a, 15c) for abutting on first stop surface (9) is formd in inner circumferential herein, described The cone angle of the connection section (5) in the region of sealing surface (7) and in the joint face (27a, 27b, 27c) region In the connecting hole (23a, 23b, 23c) cone angle ' be 38 ° to 50 °, the institute in the region of first stop surface (9) State the cone angle beta of connection section (5) and cone angle beta ' ratio of the pass through openings in the tensioning face (15a, 15c) region The cone angle of the connection section (5) in the region of the sealing surface (7) is big at least 90 °, and the shoulder (6) has One height H, this is highly 0.5mm to 5mm.

2. conduit coupling according to claim 1, it is characterised in that

The shoulder (6) has a height H, and this is highly 0.5mm to 3mm.

3. conduit coupling according to claim 2, it is characterised in that

The shoulder (6) has a height H, and this is highly 1mm to 2mm.

4. the conduit coupling according to one of claims 1 to 3, it is characterised in that

The shoulder (6) abuts directly against the sealing surface (7).

5. the conduit coupling according to one of claims 1 to 3, it is characterised in that

The cone angle of the connection section (5) in the region of the sealing surface (7) and the joint face (27a, 27b, The cone angle of the connecting hole (23a, 23b, 23c) in region 27c) ' it is 38 ° to 42 °.

6. conduit coupling according to claim 5, it is characterised in that

The cone angle of the connection section (5) in the region of the sealing surface (7) and the joint face (27a, 27b, The cone angle of the connecting hole (23a, 23b, 23c) in region 27c) ' it is 40 °.

7. the conduit coupling according to one of claims 1 to 3, it is characterised in that

The cone angle beta of the connection section (5) in the region of first stop surface (9) and the tensioning face (15a, The cone angle beta of the pass through openings in region 15c) ' it is 120 ° until including 180 °.

8. the conduit coupling according to one of claims 1 to 3, it is characterised in that

The cone angle beta of the connection section (5) in the region of first stop surface (9) and the tensioning face (15a, The cone angle beta of the pass through openings in region 15c) ' it is 140 ° or 180 °.

9. the conduit coupling according to any one of Claim 1-3, it is characterised in that

For the wall thickness s and the overall diameter d of the conduit (1) of the tube wall (3) of the conduit (1) relation, it is applicable：0.04≤ s/d≤0.08。

10. the conduit coupling according to any one of Claim 1-3, it is characterised in that

The connecting hole (23a, 23b, 23c) has the second stop surface for screwing path for being used for axially confining the conduit (1) (30b、30c)。

11. the conduit coupling according to any one of Claim 1-3, it is characterised in that

The joint face (27a, 27b, 27c) of the connecting hole (23a, 23b, 23c), which has, to be used to accommodate surrounding for seal (29b) Seal groove (28b).

12. the conduit coupling according to any one of Claim 1-3, it is characterised in that

In the connecting hole (23a, 23b, 23c), the sealing area (28c) of a hollow cylindrical adjoins the joint face (27a, 27b, 27c), a shape seal (29c) is arranged in the sealing area.

13. conduit coupling according to claim 12, it is characterised in that

Construct the shape seal (29c), with cause its with it is described in the region of the sealing surface of the conduit (1) (7) Connect the cone angle adaptation of section (5).

14. the conduit coupling according to any one of Claim 1-3, it is characterised in that

The set and locking screw connecting piece structure is locking nut (10a), wherein the connection screw thread of the connecting pipe box (20a, 20b) (25a) is configured to the external screw thread on the connecting pipe box (20a, 20b) periphery, and the tensioning screw thread (13a) is configured to Internal thread in the inner circumferential of the pass through openings of the locking nut (10a).

15. the conduit coupling according to any one of Claim 1-3, it is characterised in that

The set and locking screw connecting piece structure is clamping screw (10c), wherein the connection screw thread of the connecting pipe box (20c) (25c) is configured to the internal thread in the inner circumferential of the connecting pipe box (20c) connecting hole (23c), and the tensioning screw thread (13c) is configured to the external screw thread on the clamping screw (10c) periphery.

16. the conduit coupling of the conduit (1) of the thin-walled for connecting metal, including：

- carry the connection section (5) through deformation conduit (1), the connection section since its connection end with cone angle frustum-like shape Increase and form on its outer peripheral face circular sealing surface (7) here and with sealing surface adjoining with the The shoulder (6) of one stop surface (9),

- and connecting pipe box (20a, 20b, 20c), it carries connection screw thread (25a, 25c) and connecting hole (23a, 23b, 23c), The connecting hole is adapted since its opening with the cone angle with the connection section (5) in the region of the sealing surface (7) Cone angle ' frustum-like shape reduce, and form here in inner circumferential for abutting in surrounding on the sealing surface (7) Joint face (27a, 27b, 27c),

- and set and locking screw connector (10a, 10c), it is with tensioning screw thread (13a, 13c) and carries pass through openings, the insertion Be open has the circular tensioning face (15a) for being used for abutting on first stop surface (9) in inner circumferential, wherein, the company Socket part section (5) from the shoulder (6) until initial pipeline periphery is reduced with cone angle beta frustum-like shape, and on its outer peripheral face Circular the first stop surface (9) is formd, in the tensioning of the steering connecting pipe box (20a) of set and locking screw connector (10d) Arrangement interval ring (10e) between face (15a) and the first stop surface (9) of the conduit (1) so that in the conduit (1) most Eventually during assembling, prevent the conduit (1) from rotating together,

Characterized in that,

The cone angle of the connection section (5) in the region of the sealing surface (7) and the joint face (27a, 27b, The cone angle of the connecting hole (23a, 23b, 23c) in region 27c) ' it is 38 ° to 50 °, wherein, the spacer ring (10e) With the corresponding surface (10f) abutted on first stop surface (9), longitudinal axis of the corresponding surface in its relative duct size connector (X-X) it is adapted in terms of gradient according to the cone angle beta with the gradient of first stop surface (9).

17. conduit coupling according to claim 16, it is characterised in that

The spacer ring (10e) has the abutment face opposite with the tensioning face (15a) of the set and locking screw connector (10d) (10g), wherein the tensioning face (15a) and abutment face (10g) are orientated perpendicular to the longitudinal axis (X-X) of the conduit coupling.

18. the conduit coupling according to claim 16 or 17, it is characterised in that

The cone angle of the connection section (5) in the region of the sealing surface (7) and the joint face (27a, 27b, The cone angle of the connecting hole (23a, 23b, 23c) in region 27c) ' it is 38 ° to 42 °.

19. conduit coupling according to claim 18, it is characterised in that

The cone angle of the connection section (5) in the region of the sealing surface (7) and the joint face (27a, 27b, The cone angle of the connecting hole (23a, 23b, 23c) in region 27c) ' it is 40 °.

20. the conduit coupling according to claim 16 or 17, it is characterised in that

The cone angle beta ratio of the connection section (5) in the region of first stop surface (9) is in the area of the sealing surface (7) The cone angle of the connection section (5) in domain is big at least 90 °.

21. conduit coupling according to claim 20, it is characterised in that

The cone angle beta of the connection section (5) in the region of first stop surface (9) is 120 ° until including 180 °.

22. conduit coupling according to claim 21, it is characterised in that

The cone angle beta of the connection section (5) in the region of first stop surface (9) is 140 ° or 180 °.

23. conduit coupling according to claim 16, it is characterised in that

The shoulder (6) has a height H, and this is highly 0.5mm to 5mm.

24. conduit coupling according to claim 23, it is characterised in that

The shoulder (6) has a height H, and this is highly 0.5mm to 3mm.

25. conduit coupling according to claim 24, it is characterised in that

The shoulder (6) has a height H, and this is highly 1mm to 2mm.

26. the conduit coupling according to one of claim 23 to 25, it is characterised in that

The shoulder (6) abuts directly against the sealing surface (7).

27. the conduit coupling according to claim 16 or 17, it is characterised in that

For the wall thickness s and the overall diameter d of the conduit (1) of the tube wall (3) of the conduit (1) relation, it is applicable：0.04≤ s/d≤0.08。

28. the conduit coupling according to claim 16 or 17, it is characterised in that

The connecting hole (23a, 23b, 23c) has the second stop surface for screwing path for being used for axially confining the conduit (1) (30b、30c)。

29. the conduit coupling according to claim 16 or 17, it is characterised in that

The joint face (27a, 27b, 27c) of the connecting hole (23a, 23b, 23c), which has, to be used to accommodate surrounding for seal (29b) Seal groove (28b).

30. the conduit coupling according to claim 16 or 17, it is characterised in that

In the connecting hole (23a, 23b, 23c), the sealing area (28c) of a hollow cylindrical adjoins the joint face (27a, 27b, 27c), a shape seal (29c) is arranged in the sealing area.

31. conduit coupling according to claim 30, it is characterised in that

Construct the shape seal (29c), with cause its with it is described in the region of the sealing surface of the conduit (1) (7) Connect the cone angle adaptation of section (5).

32. the conduit coupling according to claim 16 or 17, it is characterised in that

The set and locking screw connecting piece structure is locking nut (10a), wherein the connection screw thread of the connecting pipe box (20a, 20b) (25a) is configured to the external screw thread on the connecting pipe box (20a, 20b) periphery, and the tensioning screw thread (13a) is configured to Internal thread in the inner circumferential of the pass through openings of the locking nut (10a).

33. the conduit coupling according to claim 16 or 17, it is characterised in that

The set and locking screw connecting piece structure is clamping screw (10c), wherein the connection screw thread of the connecting pipe box (20c) (25c) is configured to the internal thread in the inner circumferential of the connecting pipe box (20c) connecting hole (23c), and the tensioning screw thread (13c) is configured to the external screw thread on the clamping screw (10c) periphery.